It's just a series of one-liners which don't add up to a coherent whole (like all of his films, it's actually terrible deep down)... with a few people (with/without drinks), it's absolutely great fun but on your own you have to concentrate on the non-plot and the jokes which aren't actually that funny. Some sort of group magic happens with that film.

obviously if you've heard 3/4 of the film quoted by everyone around you, the actual film isn't exactly going to surprise you, you'll just be playing i-spy catchphrase and all impact will be lost. hell, if i'd seen it now after all that i doubt that i'd enjoy it either. you left it too late, now you can never enjoy a very funny film. sorry.